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It means a fly ash which is reprocessed in compliance to Korean Quality
Standard (KS L 5405) regulates a quality of fly ash for use in concrete.
| ITEM |
Regulations |
Chemical
Properties |
SiO2 |
45% Min |
| Moisture |
1% Max |
| Loss of Ignition |
5% Max |
Physical
Properties |
Specific Gravity |
1.95 Max |
Surface Area of Fineness
(Brain method) §²/g |
2400 Min |
| Compressive Strength % |
28 day |
60 Min |
Size : Generally 1 ~ 100§ and 20 ~ 30§ in average
Shape : Sphere
Color : Gray
It consists chiefly of 50 ~ 60% of SiO2, 20 ~ 25% of Al2O3 and other
trace elements such as C2O, MgO, Na2O, K2O
Most of refined fly ash are used in conrete / remicon as substitute for
Portland cement. Even though not fixed but it could be replaced in propotion
fo 5 ~ 20% for Portland cement, which consequently improve the quality of
concrete and cost-savings.
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